Photo taken on Aug. 25, 2020 shows flower fields at Nanniwan scenic area in Yan'an, northwest China's Shaanxi Province.

Aerial photo taken on Aug. 25, 2020 shows a view of Nanniwan in Yan'an, northwest China's Shaanxi Province.

Aerial photo taken on Aug. 25, 2020 shows vehicles moving past Nanniwan scenic area in Yan'an, northwest China's Shaanxi Province.

People visit a wetland park at Nanniwan scenic area in Yan'an, northwest China's Shaanxi Province, Aug. 19, 2020.

People visit a flower field at Nanniwan scenic area in Yan'an, northwest China's Shaanxi Province, Aug. 19, 2020.

Aerial photo taken on Aug. 19, 2020 shows people visiting flower fields at Nanniwan scenic area in Yan'an, northwest China's Shaanxi Province. (Photos: Qi Xiaojun/Xinhua)